Save time by pumping or pouring into Medela Pump & Save Breastmilk Bags with the easy-connect adaptor for fast, easy breastmilk storage. Oxygen barrier preserves & protects breastmilk nutrients. No-leak, easy-to-close zipper top & no-spill, stand-up bottom. Convenient, pre-sterilized, double walled bags for safe milk storage. Medela Part #87233 or 87234.